1
Q
Describe 1st ionisation energy.
A
The energy required to remove one electron from each atom in one mole of gaseous atoms, forming one mile of gaseous 1+ ions.
2
Q
Describe 2nd ionisation energy.
A
Energy required to remove one electron from each ion in one mile of gaseous 1+ ions forming one mile of gaseous 2+ ions.
3
Q
What is a precipitate?
A
A solid formed when two solutions are mixed.
4
Q
Describe an exothermic reaction.
A
Gives heat to it’s surroundings, temperature goes up.
5
Q
What is an endothermic reaction?
A
Takes in heat from surroundings and the temperature goes down.
6
Q
What is periodicity?
A
Across a period, the repeating pattern in properties of the elements.
OCR Chemistry AS 2016
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